Acts 16:25-26

Later, in the middle of the night, Paul and Silas were praying out loud to God and saying that he is really good, and they were singing songs to God. The other prisoners were listening to them. Suddenly there was a very big earthquake. It shook the jail, and even the cement underneath it, and all the doors of the jail swung open, and all the chains fell off the arms and legs of all the prisoners.